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Subnanosecond charge photogeneration and recombination in polyfluorene copolymer-fullerene solar cell: Effects of electric field

Wei Zhang, Ye Huang, Ya-Dong Xing, Yan Jing, Long Ye, Li-Min Fu, Xi-Cheng Ai, Jian-Hui Hou, and Jian-Ping Zhang

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Abstract

Influence of electric field on the subnanosecond charge photogeneration dynamics in the polymer solar cell based on polyfluorene copolymer BisDMO-PFDTBT blended with PC61BM was examined with transient absorption spectroscopy. The charge dynamics showed no difference under short- or open-circuit conditions and under a forward bias of 0.79 V (1.6 × 105 V/cm), implying negligible field effects on the subnanosecond dynamics of charge photogeneration/recombination. However, under the reverse biases of −2 V (4.0 × 105 V/cm) and −5 V (1.0 × 106 V/cm), significant enhancement of charge photogeneration and apparent suppression of polaron pair recombination were observed, which agrees with the field-assisted enhancement of external quantum efficiency of the solar cell devices.

©2013 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 (a) UV-visible absorption spectra of the BisDMO-PFDTBT/PC61BM (1:3) photoactive layer in real solar cell device (thicker solid), the neat films of BisDMO-PFDTBT (thinner solid) and PC61BM (dashed). Insets are the molecular structures. Arrow points to the excitation wavelength for time-resolved measurements (610 nm). (b) Typical current-voltage (I-V) curve of the solar cells determined under AM 1.5 G illumination (▾) and in dark (◼).

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Fig. 2
Fig. 2 Representative time-resolved spectra for the BisDMO-PFDTBT/PC61BM solar cell at indicated bias potentials and delay times. Excitation wavelength was 610 nm (~1.0 × 1013 photons·cm−2·pulse−1). The depleted sections around 1200 nm are due to the interference from the second order diffraction of the excitation pulses.

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Fig. 3
Fig. 3 Time-evolution profiles probed at (a) 970 nm and (b) 1050 nm for the BisDMO-PFDTBT/PC61BM solar cell at indicated bias potentials (cf Fig. 2. Normalized to the amplitudes maxima at 0.13 ps). Solid lines were obtained by global fitting of the kinetics to the model function ΔOD= A 1 t − α 1 + A 2 t − α 2 , see text for details).

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Fig. 4
Fig. 4 The EQE curves of the BisDMO-PFDTBT/PC61BM device (1:3, w/w) determined under short circuit (0 V) and at the forwards (Vf) and the reverse (Vr) biases.

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Tables (1)

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Table 1 Power-law exponents (α) obtained by global fitting of the 970 nm and the 1050 nm kinetics under individual bias voltages (cf Fig. 3).

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